Murdered serial numbers?

Drakon

Neo Bubble Buster
I apologize if this has been answered elsewhere. I borrowed a shock troopers cart from a friend and noticed that the serial number part of the label had literally been cut out with an exacto knife. I've also noticed some mvs auctions on ebay have carts with the serial number either removed or blackened with a marker. So my question is....what's the reason for destroying these serial numbers?
 

Phyeir

My only regret is that I have... Boneitis!
They weren't suppose to be selling carts in the open market, so back when SNK was chasing these people, removing the serials was a way to keep the carts from being traced back to you. What I've always found strange is how high the percentage is on Metal Slug... you'd think you'd see it a little more across the board
 
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